second thought

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Alternative spelling of second thoughts
If you do something without a second thought, you do it without thinking about it carefully, usually because you do not have enough time or you do not care very much. This murderous lunatic could kill them both without a second thought Roberto didn't give a second thought to borrowing $2,000 from him
reconsideration: thinking again about a choice previously made; "he had second thoughts about his purchase"
If you have second thoughts about a decision that you have made, you begin to doubt whether it was the best thing to do. I had never had second thoughts about my decision to leave the company
You can say on second thoughts or on second thought when you suddenly change your mind about something that you are saying or something that you have decided to do. `Wait there!' Kathryn rose. `No, on second thought, follow me.'. A reconsideration of a decision or opinion previously made
{i} afterthought
on second thought
After reconsidering; on further consideration

I originally thought that it was a good idea, but on second thought I'm not so sure.

second thoughts
The process of raising doubt or coming to a different conclusion through further consideration; the doubts or new conclusion resulting from this process

I phoned her with second thoughts about our relationship.

a second thought
(deyim) (not to give a second thought) Used to say that someone does not think or worry about something

She said "I wouldn't give that a second thought.".

a second thought with
(deyim) (negative) More than the slightest consideration
on second thought
after considering it again, after thinking again
second thoughts
additional thoughts, additional reflection; feelings of regret
second thought